Is the spring needed. I believe so, remember the eccentric cam on 16 square hole type water pump has a hidden pin which is installed when the cam is not fully seated..With the pin in place, it engages the slot in the cam, but, is clear of the cam at the other end, the cam then can be
pressed down ,closing off the pin from the holes in cam. The spring
installed on prop shaft between sheer pin and face of cam serves to
keep cam from moving up shaft and possibly allowing the cam drive
pin out.
The grease seal packing is formed inside base of eccentric
cam…so far as I know no packing cup with the 16 square hole.
I have found making a pin that will fit and function involves a lot of file
and try, file and try,tile and try. Approximate length is diameter of shaft
1/2″ plus depth of slot 1/16″
The 16 square hole and 7 slit oscillator type water pumps share some
parts and there is some swapping possible.
The 7 slit seems to have the packing in a cup grease seal. I have not seen it on the earlier pumps. Like all small parts on old outboards
sometimes they wandered off while being serviced.
The 3 slit casting water pump is the only one where a vane was originally installed. I do not believe the vane impeller will physically
fit due to the raised ledge, or it the ledge is removed the intakes may
not be clocked in right position for vane to work.
Leather seals…ALL models of the Early K Model from K1 to WG4 came with a leather or raw hide lower drive shaft seal. I have even
found one or two still in decent shape. I reinvented the wheel to devise
a method to make leather seals. A small item that was in the back of my mind for years, that came to me in minutes from idea to finished
seal.
I will make photos and share.
Louis
